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High-Frequency Cycloconverter Suitable for Alternative Energy Systems

High-Frequency Cycloconverter Suitable for Alternative Energy Systems. Robert S. Balog , PhD, PE. University of Illinois at Urbana – Champaign. The Power Affiliates Program Annual Review, May 12, 2006. “Conventional” Inverter Design.

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High-Frequency Cycloconverter Suitable for Alternative Energy Systems

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  1. High-Frequency Cycloconverter Suitable for Alternative Energy Systems Robert S. Balog, PhD, PE University of Illinois at Urbana – Champaign The Power Affiliates Program Annual Review, May 12, 2006

  2. “Conventional” Inverter Design Transformer isolation for safety (high frequency), battery for backup / transients, traditional inverter for ac output … DC DC AC DC AC

  3. UIUC Proposed Inverter Design Transformer isolation for safety (high frequency), battery for backup / transients, eliminate rectifier and filter… DC DC AC AC …but requires new control techniques for ac to ac output converter

  4. Square-Wave Cycloconverter w/Multi-Carrier PWM Control

  5. Switch Configurations

  6. HF Link Commutation

  7. Zero-Cross Commutation Reverse Recovery = Finite time to turn-off switch (Can’t turn on Q5 & Q6 until Q1 & Q2 “recovers”)

  8. Current-Limiting Reactor Inter-group inductance limits short-circuit current

  9. Dead Time Break – Before – Make (requires logic)

  10. New Technique – Patent Pending Choose next switch pair that can support polarity of the link voltage and allow current to cross through zero

  11. Correct Switching Sequence Split into 4 pairs of switches, depending on polarity of HF Positive Converter: Q1 & Q2, Q3 & Q4 Negative Converter: Q7 & Q8, Q5 & Q6

  12. State Machine Implementation

  13. Experimental Hardware

  14. Experimental Results

  15. New Control Techniques for High-Frequency Link Cycloconverter • Multi-carrier PWM • Overcomes historical difficulty in cycloconverter control • Output waveforms are identical to traditional PWM • Ripple is at twice the switching frequency • Support bi-directional power flow • Current commutation technique • Manages output-bridge switching • Solves not mitigates current zero-cross problem • Applicable to other modulation schemes

  16. Intellectual Property Patents R. S. Balog and P. T. Krein, "Commutation technique for an AC-to-AC converter based on state machine control," US Patent application no. 11/202,597, filed 8/11/2005. P. T. Krein, "Systems and methods for pulse width modulation," U.S. Patent 6,700,803, March 2, 2004. Journal Papers R. S. Balog and P. T. Krein, "Commutation technique for high-frequency link cycloconverter," IEEE Power Electronics Letters, Sept. 2005. P. T. Krein, R. S. Balog, and X. Geng, "High-frequency link inverter for fuel cells based on multiple-carrier PWM," IEEE Transactions on Power Electronics, Sept. 2004. Conference Papers P. T. Krein, X. Geng, and R. Balog, "High-frequency link inverter based on multiple-carrier PWM," in Proceedings, IEEE Applied Power Electronics Conference, 2002. P. T. Krein and R. Balog, "Low cost inverter suitable for medium-power fuel cell sources,“ in Record, IEEE Power Electronics Specialists Conference, 2002.

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